Fair Value Measurements - Quantitative inputs and assumptions for Level 3 financial instruments carried at fair value on nonrecurring basis (Details) $ in Thousands	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Servicing liability	$ 1	$ 14
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Servicing liability	1	14
Fair Value Measurements Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	42,327	44,313
Servicing asset, net	839	804
Assets held for sale		2,268
Fair Value Measurements Nonrecurring | Level 3 | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	42,327	44,313
Servicing asset, net	$ 839	804
Fair Value Measurements Nonrecurring | Level 3 | Fair Value | Sale & income approach
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets held for sale		$ 2,268
Fair Value Measurements Nonrecurring | Level 3 | Discount rate | Fair Value | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Servicing asset, measurement input (percent)		0.1000
Servicing liability, measurement input (percent)	0.035	0.008
Fair Value Measurements Nonrecurring | Level 3 | Discount rate | Fair Value | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Servicing asset, measurement input (percent)	0.1000
Fair Value Measurements Nonrecurring | Level 3 | Discount rate | Fair Value | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Servicing asset, measurement input (percent)	0.1150
Fair Value Measurements Nonrecurring | Level 3 | Prepayment rate | Fair Value | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Servicing asset, measurement input (percent)	0.0300	0.0300
Fair Value Measurements Nonrecurring | Level 3 | Prepayment rate | Fair Value | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Servicing asset, measurement input (percent)	0.1700	0.1700
Fair Value Measurements Nonrecurring | Level 3 | Impaired loans | Fair Value | Appraisals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	$ 17,795	$ 18,548
Fair Value Measurements Nonrecurring | Level 3 | Impaired loans | Fair Value | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loans	$ 24,532	$ 25,765
Fair Value Measurements Nonrecurring | Level 3 | Impaired loans | Discount to appraised value | Fair Value | Appraisals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loan, measurement input (percent)	0.0800	0.0800
Fair Value Measurements Nonrecurring | Level 3 | Impaired loans | Discount rate | Fair Value | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loan, measurement input (percent)	0.0300	0.0300
Fair Value Measurements Nonrecurring | Level 3 | Impaired loans | Discount rate | Fair Value | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impaired loan, measurement input (percent)	0.0650	0.0675